stm32F1外部脉冲计数(库函数实现)

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);//使能GPIOA和TIM2的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
TIM_DeInit(TIM2);
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟使能
TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);//使能TIM2中断
TIM_SetCounter(TIM2,0);
TIM_Cmd(TIM2,ENABLE);
}
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
LED1=!LED1;
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update);
}
}
#include "usart.h"
#include "oled.h"
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
主函数
#include "stm32f10x.h"
#include "timer.h"
#include "led.h"
#include "delay.h"
#include "oled.h"
#include "sys.h"
int main(void)
{
u16 t=0;
delay_init();
LED_Init();
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIMx在CCR2上的预装载寄存器
TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIMx外设
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
NVIC_Init(&NVIC_InitStructure); //中断优先级设置，抢占优先级为1，响应优先级为3
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
TIM_ETRClockMode2Config(TIM2,TIM_ExtTRGPSC_OFF,TIM_ExtTRGPolarity_NonInverted,10);
//ExtTRGFilter：外部触发滤波器。该参数取值在0x0和0xF之间。在我所在的环境下设置为10经检测最准确。
NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;
}
//定时器2外部脉冲计数函数
void TIM2_Excnt_Init(u16 arr)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM3_PWM_Init(9999,719);
TIM2_Excnt_Init(10);
OLED_Init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
OLED_ShowString(20,0,"EXCNT_TEST",16);
OLED_Refresh_Gram();
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=arr;
TIM_TimeBaseStructure.TIM_Prescaler=0;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5//用于TIM3的CH2输出的PWM通过该LED显示
//设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//GPIO_WriteBit(GPIOA, GPIO_Pin_7,Bit_SET); // PA7上拉
TIM_SetCompare2(TIM3,1000);
while(1)
{
delay_ms(1);
t=TIM_GetCounter(TIM2);
OLED_ShowNum(20,30,t,6,16);
OLED_Refresh_GraБайду номын сангаас();
}
}
timer.c
#include "timer.h"
#include "led.h"
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;